Thomas hall



(No Model.)

T. HALL TYPE PLATE FOR TYPE WRITING MACHINES. No. 336,481. Patented Feb.16, 1886.

UNITED STATES PATENT OFFICE.

THOMAS HALL, OF NEW YORK, N. Y., ASSIGNOR TO THE HALL TYPE WRITERCOMPANY, OF SAME PLACE.

TYPE-PLATE FOR TYPE-WRITING MACHINES.

SPECIFICATION forming part of Letters Patent No. 336,481, dated February16, 1886.

Application filed September 1, 1884. Serial No. 141,950. (No model.)

1" all whom it may concern:

Be it known that I, THOMAS HALL, of New York, in the county of New Yorkand State of New York, have invented a 'new and useful ImprovementinType-Plates for VVriting-Machines; and I do hereby declare that the following, is a full, clear, and exact description of the same.

My invention relates to type-writers of that class in which the type areset upon a plate,

which is moved to bring the letters into alignment. It is particularlydesigned for the type-writer shown in Letters Patent granted me by theUnited States on the 1st day of March, 1881, but it may be used in otherforms of type-writer, or in a machine not in all respects the same asthat shown in said patent.

In the accompanying drawings, Figure 1 shows a section taken verticallythrough the plate and type. Fig. 2 shows a section of a modified form.Fig. 3 shows another modification.

In carrying out my invention I may use several methods or plans,differing somewhat in detail, but all involving the same generalprinciple of the elastic or flexible plate and hardened letters. In thefirst place, I make the type-form and letters of rubber, as described inmy said patent, theform and structure being precisely the same; but ofthis rubber I make that of which the letters are formed sufficientlyhard by the ordinary processes to print through several thicknesses ofpaper at the same time, while the plate or back is also madesufficiently elastic or flexible to be depressed out of line with itsframe and through the opening in the bottom plate of the machine abovereferred to. I may make this same form by using in the type form orplate two kinds of rubber, one for the types that will vulcanize hardand the other for a plate which will remain soft or flexible between thetypes. This is shown in Fig. 1, in which a represents the soft andflexible part of the 5 plate, and b represents the hardened type.

I may carry out my invention in another way by forming the type plate ofthin flexible metal, as shown in Fig. 2. This plate is made byelectroplating over a suitable form, the. face of the electrotype-plateshowing the letter in relief, as at c and the back showing thedepression, as at d. In this case the letters are hard and capable ofprinting through several thicknesses of paper, while the plate issufiiciently elastic or flexible to allow the letters to be depressedthrough the opening in the bottom plate, as explained in my said patent.

Fig. 3 shows also another mode of forming the type-plate in which theletters 0 are made of metal and are attached to a flexible sheet, f, ofrubber or other material. It will be understood that this plate iscarried in a frame, (shown at F.) This surrounds and carries the plateand form and holds the edges rigidly while a part of the plate istemporarily bent or sprung out of line of the frame.

I claim as my invention- A type-plate consisting of a backing of elasticmaterial having hard types fixed upon it, in combination with the framesurrounding and holding the edges of said plate, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOS. HALL.

Witnesses:

J AS. S. HALL, V. H. YARNALL.

